feat(dashboard): add light/dark theme with sidebar toggle (#81)

compliance-dashboard/Cargo.toml

@@ -51,7 +51,7 @@ thiserror = { workspace = true }
 
 # Web-only
 reqwest = { workspace = true, optional = true }
-web-sys = { version = "0.3", optional = true, features = ["Blob", "BlobPropertyBag", "HtmlAnchorElement", "Url", "Document", "Window"] }
+web-sys = { version = "0.3", optional = true, features = ["Blob", "BlobPropertyBag", "HtmlAnchorElement", "Url", "Document", "Element", "Window", "Storage", "MediaQueryList"] }
 js-sys = { version = "0.3", optional = true }
 wasm-bindgen = { version = "0.2", optional = true }
 gloo-timers = { version = "0.3", features = ["futures"], optional = true }

compliance-dashboard/assets/main.css

@@ -61,6 +61,77 @@
     --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
 }
 
+/* ── Light theme tokens ──
+   Applied when the user has explicitly chosen light (`data-theme="light"`)
+   OR when their OS prefers light AND they have made no explicit choice. */
+:root[data-theme="light"] {
+    --bg-primary: #f5f7fb;
+    --bg-secondary: #ffffff;
+    --bg-card: rgba(255, 255, 255, 0.85);
+    --bg-card-solid: #ffffff;
+    --bg-card-hover: #f1f5fb;
+    --bg-elevated: #f8fafc;
+
+    --text-primary: #0c1426;
+    --text-secondary: #475569;
+    --text-tertiary: #8a9bb4;
+
+    --accent: #0070d4;
+    --accent-hover: #0080f0;
+    --accent-muted: rgba(0, 112, 212, 0.10);
+    --accent-glow: 0 0 20px rgba(0, 112, 212, 0.10);
+
+    --border: #e2e8f0;
+    --border-bright: #cbd5e1;
+    --border-accent: rgba(0, 112, 212, 0.30);
+
+    --danger: #dc2626;
+    --danger-bg: rgba(220, 38, 38, 0.08);
+    --warning: #d97706;
+    --warning-bg: rgba(217, 119, 6, 0.08);
+    --success: #16a34a;
+    --success-bg: rgba(22, 163, 74, 0.08);
+    --info: #2563eb;
+    --info-bg: rgba(37, 99, 235, 0.08);
+    --orange: #ea580c;
+    --orange-bg: rgba(234, 88, 12, 0.08);
+}
+
+@media (prefers-color-scheme: light) {
+    :root:not([data-theme="dark"]) {
+        --bg-primary: #f5f7fb;
+        --bg-secondary: #ffffff;
+        --bg-card: rgba(255, 255, 255, 0.85);
+        --bg-card-solid: #ffffff;
+        --bg-card-hover: #f1f5fb;
+        --bg-elevated: #f8fafc;
+
+        --text-primary: #0c1426;
+        --text-secondary: #475569;
+        --text-tertiary: #8a9bb4;
+
+        --accent: #0070d4;
+        --accent-hover: #0080f0;
+        --accent-muted: rgba(0, 112, 212, 0.10);
+        --accent-glow: 0 0 20px rgba(0, 112, 212, 0.10);
+
+        --border: #e2e8f0;
+        --border-bright: #cbd5e1;
+        --border-accent: rgba(0, 112, 212, 0.30);
+
+        --danger: #dc2626;
+        --danger-bg: rgba(220, 38, 38, 0.08);
+        --warning: #d97706;
+        --warning-bg: rgba(217, 119, 6, 0.08);
+        --success: #16a34a;
+        --success-bg: rgba(22, 163, 74, 0.08);
+        --info: #2563eb;
+        --info-bg: rgba(37, 99, 235, 0.08);
+        --orange: #ea580c;
+        --orange-bg: rgba(234, 88, 12, 0.08);
+    }
+}
+
 
 /* ── Reset & Base ── */
 
@@ -396,6 +467,44 @@ code {
     background: rgba(0, 200, 255, 0.06);
 }
 
+.theme-toggle {
+    background: none;
+    border: none;
+    border-top: 1px solid var(--border);
+    color: var(--text-secondary);
+    padding: 11px 18px;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    gap: 11px;
+    font-family: var(--font-body);
+    font-size: 13.5px;
+    font-weight: 500;
+    transition: color 0.2s, background 0.2s;
+    width: 100%;
+    text-align: left;
+}
+
+.theme-toggle:hover {
+    color: var(--accent);
+    background: var(--accent-muted);
+}
+
+.theme-toggle svg {
+    flex-shrink: 0;
+    opacity: 0.75;
+    transition: opacity 0.2s;
+}
+
+.theme-toggle:hover svg {
+    opacity: 1;
+}
+
+.sidebar.collapsed .theme-toggle {
+    justify-content: center;
+    padding: 11px 0;
+}
+
 .sidebar.collapsed .sidebar-header {
     padding: 22px 0;
     justify-content: center;
@@ -3889,3 +3998,33 @@ tbody tr:last-child td {
 .copyable code, .copyable .mono { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .code-snippet-wrapper { position: relative; }
 .code-snippet-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; gap: 8px; }
+
+
+/* ═══════════════════════════════════════════════════════════════
+   LIGHT THEME — surface overrides for the few hardcoded dark
+   colors that don't go through CSS custom properties.
+   ═══════════════════════════════════════════════════════════════ */
+
+:root[data-theme="light"] .main-content {
+    background-image: radial-gradient(circle at 1px 1px, rgba(100, 116, 139, 0.18) 1px, transparent 0);
+}
+:root[data-theme="light"] .code-block {
+    background: #f8fafc;
+    color: #0c1426;
+}
+:root[data-theme="light"] .graph-stab-overlay {
+    background: radial-gradient(ellipse at center, rgba(245, 247, 251, 0.92) 0%, rgba(245, 247, 251, 0.98) 100%);
+}
+
+@media (prefers-color-scheme: light) {
+    :root:not([data-theme="dark"]) .main-content {
+        background-image: radial-gradient(circle at 1px 1px, rgba(100, 116, 139, 0.18) 1px, transparent 0);
+    }
+    :root:not([data-theme="dark"]) .code-block {
+        background: #f8fafc;
+        color: #0c1426;
+    }
+    :root:not([data-theme="dark"]) .graph-stab-overlay {
+        background: radial-gradient(ellipse at center, rgba(245, 247, 251, 0.92) 0%, rgba(245, 247, 251, 0.98) 100%);
+    }
+}

compliance-dashboard/src/components/mod.rs

@@ -12,4 +12,5 @@ pub mod pentest_wizard;
 pub mod severity_badge;
 pub mod sidebar;
 pub mod stat_card;
+pub mod theme_toggle;
 pub mod toast;

compliance-dashboard/src/components/sidebar.rs

@@ -4,6 +4,7 @@ use dioxus_free_icons::icons::bs_icons::*;
 use dioxus_free_icons::Icon;
 
 use crate::app::Route;
+use crate::components::theme_toggle::ThemeToggle;
 
 struct NavItem {
     label: &'static str,
@@ -106,6 +107,7 @@ pub fn Sidebar() -> Element {
             }
             // Spacer pushes footer to the bottom
             div { class: "sidebar-spacer" }
+            ThemeToggle { collapsed: collapsed() }
             button {
                 class: "sidebar-toggle",
                 onclick: move |_| collapsed.set(!collapsed()),

compliance-dashboard/src/components/theme_toggle.rs

@@ -0,0 +1,104 @@
+use dioxus::prelude::*;
+use dioxus_free_icons::icons::bs_icons::{BsMoonStars, BsSun};
+use dioxus_free_icons::Icon;
+
+#[cfg(feature = "web")]
+const STORAGE_KEY: &str = "compliance-scanner.theme";
+
+/// Sidebar-footer theme toggle. Reads the initial state on mount from
+/// localStorage (explicit user choice) or `prefers-color-scheme` (OS default),
+/// then writes back to both the `<html data-theme="...">` attribute and
+/// localStorage on every click.
+#[component]
+pub fn ThemeToggle(collapsed: bool) -> Element {
+    // `None` until the on-mount effect resolves the real value, so SSR doesn't
+    // render the wrong icon for the user's actual theme.
+    let mut is_dark = use_signal(|| None::<bool>);
+
+    use_effect(move || {
+        let (dark, from_storage) = initial_theme();
+        is_dark.set(Some(dark));
+        // If the user already made an explicit choice (in localStorage), assert it
+        // on the DOM so an OS-vs-stored mismatch can't briefly show the wrong theme.
+        if from_storage {
+            apply_theme(dark);
+        }
+    });
+
+    let label = if collapsed {
+        ""
+    } else if is_dark().unwrap_or(true) {
+        "Light mode"
+    } else {
+        "Dark mode"
+    };
+
+    let title = if is_dark().unwrap_or(true) {
+        "Switch to light mode"
+    } else {
+        "Switch to dark mode"
+    };
+
+    rsx! {
+        button {
+            class: "theme-toggle",
+            r#type: "button",
+            title: "{title}",
+            "aria-label": "{title}",
+            onclick: move |_| {
+                let next_dark = !is_dark().unwrap_or(true);
+                is_dark.set(Some(next_dark));
+                apply_theme(next_dark);
+            },
+            if is_dark().unwrap_or(true) {
+                Icon { icon: BsSun, width: 16, height: 16 }
+            } else {
+                Icon { icon: BsMoonStars, width: 16, height: 16 }
+            }
+            if !collapsed {
+                span { class: "theme-toggle-label", "{label}" }
+            }
+        }
+    }
+}
+
+/// Returns `(is_dark, from_storage)`. `from_storage` is true when an explicit
+/// user choice is in localStorage; false when we fell back to OS preference
+/// (or to the dark default).
+#[cfg(feature = "web")]
+fn initial_theme() -> (bool, bool) {
+    if let Some(window) = web_sys::window() {
+        if let Ok(Some(storage)) = window.local_storage() {
+            if let Ok(Some(value)) = storage.get_item(STORAGE_KEY) {
+                return (value == "dark", true);
+            }
+        }
+        if let Ok(Some(mql)) = window.match_media("(prefers-color-scheme: dark)") {
+            return (mql.matches(), false);
+        }
+    }
+    (true, false)
+}
+
+#[cfg(not(feature = "web"))]
+fn initial_theme() -> (bool, bool) {
+    (true, false)
+}
+
+#[cfg(feature = "web")]
+fn apply_theme(dark: bool) {
+    let theme = if dark { "dark" } else { "light" };
+    if let Some(window) = web_sys::window() {
+        if let Some(document) = window.document() {
+            if let Some(root) = document.document_element() {
+                let _ = root.set_attribute("data-theme", theme);
+            }
+        }
+        if let Ok(Some(storage)) = window.local_storage() {
+            let _ = storage.set_item(STORAGE_KEY, theme);
+        }
+    }
+}
+
+#[cfg(not(feature = "web"))]
+fn apply_theme(_dark: bool) {}